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150 Important Electrostatics and Capacitance MCQ Question and Answer | PDF Free Download

Electrostatics and Capacitance MCQ Question and Answer | PDF Free Download

1.The force between two charges is 120 N. if the distance between the charges is doubled, the force will be

  • A60 N
  • B30 N
  • C40 N
  • D20 N
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Correct Answer : (B)

30 N

Explanation:

The force between two charges is 120 N. if the distance between the charges is doubled, the force will be 30 N.

2.The electric field intensity at a point situated 4 meters from a point charge is 200 N/C. If the distance is reduced to 2 meters, the field intensity will be

  • A400 N/C
  • B600 N/C
  • C800 N/C
  • D1200 N/C
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Correct Answer : (C)

800 N/C

Explanation:

3.The lines of force due to charge particles are

  • AAlways straight
  • BAlways curved
  • CSometimes curved
  • DNone of the above
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Correct Answer : (B)

Always curved

Explanation:

The lines of force due to charge particles are Always curved.

4.The electric field at a point situated at a distance d from straight charged conductor is

  • AProportional to d
  • BInversely proportional to d
  • CInversely proportional to square of distance
  • DNone of the above
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Correct Answer : (B)

Inversely proportional to d

Explanation:

The electric field at a point situated at a distance d from straight charged conductor is Inversely proportional to d.

5.The direction of electric field due to positive charge is

  • AAway from the charge
  • BTowards the charge
  • CBoth (a) and (b)
  • DNone of the above
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Correct Answer : (A)

Away from the charge

Explanation:

The direction of electric field due to positive charge is Away from the charge.

6.A field line and an equipotential surface are

  • AAlways parallel
  • BAlways at 90°
  • CInclined at any angle 
  • DNone of the above
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Correct Answer : (B)

Always at 90°

Explanation:

A field line and an equipotential surface are Always at 90?

7.The ability of charged bodies to exert force on one another is attributed to the existence of

  • AElectrons
  • BProtons
  • CNeutrons
  • DElectric field
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Correct Answer : (D)

Electric field

Explanation:

The ability of charged bodies to exert force on one another is attributed to the existence of Electric field.

8.If the sheet of a Bakelite is inserted between plates of an air capacitor, the capacitance will

  • Adecrease
  • Bincrease
  • Cremain unchanged
  • Dbecome zero
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Correct Answer : (B)

increase

Explanation:

If the sheet of a Bakelite is inserted between plates of an air capacitor, the capacitance will increase.

9.A capacitor stores 0.24 coulombs at 10 volts. Its capacitance is

  • A0.024 F
  • B0.12 F
  • C0.6 F
  • D0.8 F
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Correct Answer : (A)

0.024 F

Explanation:

A capacitor stores 0.24 coulombs at 10 volts. Its capacitance is 0.024 F.

10.For making a capacitor, it is better to select a dielectric having

  • ALow permittivity
  • BHigh permittivity
  • CPermittivity same as that of air
  • DPermittivity slightly more than that of air
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Correct Answer : (B)

High permittivity

Explanation:

For making a capacitor, it is better to select a dielectric having High permittivity.

11.The units of capacitance are

  • AVolts/coulombs
  • BCoulombs/volts
  • COhms
  • DHennery/wb
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Correct Answer : (B)

Coulombs/volts

Explanation:

The units of capacitance are Coulombs/volts.

12.The unit of capacitance is

  • AHennery
  • BOhm
  • CFarad
  • DFarad/m
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Correct Answer : (A)

Hennery

Explanation:

The unit of capacitance is Farad.

13.A dielectric material must be

  • AResistor
  • BInsulator
  • CGood conductor
  • DSemi-conductor
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Correct Answer : (B)

Insulator

Explanation:

A dielectric material must be Insulator.

14.The electrolytic capacitor can be used for

  • ADC only
  • BAC only
  • CBoth DC as well as AC
  • DNone of these
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Correct Answer : (A)

DC only

Explanation:

The electrolytic capacitor can be used for DC only.

15.The capacitance of a capacitor is not affected by

  • ADistance between plates
  • BArea of plates
  • CThickness of plates
  • DAll of the above
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Correct Answer : (C)

Thickness of plates

Explanation:

The capacitance of a capacitor is not affected by Thickness of plates.

16.Which of the following is not a vector?

  • ALinear momentum
  • BAngular momentum
  • CElectric field
  • DElectric potential
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Correct Answer : (D)

Electric potential

Explanation:

17.Two metal plates distance ?d? apart from a capacitor of value C farads. Another metal plate of thickness d/2 and of the same areas is inserted in between these two plates, capacitance of this three plate capacitor will be

  • A4
  • B2
  • C?
  • D?
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Correct Answer : (B)

2

Explanation:

18.Electric field inside a hollow metallic charged sphere is

  • AIncreasing towards centre
  • BDecreasing towards centre
  • CZero
  • DNone of the above
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Correct Answer : (C)

Zero

Explanation:

Electric field inside a hollow metallic charged sphere is Zero.

19.Two plates of parallel plate capacitor after being charges from a constant voltage source is separated apart by means of insulated handles, then the

  • AVoltage across the plates increases
  • BVoltage across the plate decreases
  • CCharge on the capacitor decreases
  • DCharge on the capacitor increases
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Correct Answer : (B)

Voltage across the plate decreases

Explanation:

20.If AC voltage is applied to capacitive circuit, the alternating current can be flow in the circuit because

  • AVarying voltage produces the charging and discharging currents
  • BOf high peak value
  • CCharging current can flow
  • DDischarge current can flow
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Correct Answer : (A)

Varying voltage produces the charging and discharging currents

Explanation:

If AC voltage is applied to capacitive circuit, the alternating current can be flow in the circuit because Varying voltage produces the charging and discharging currents.